london



unrrso sTA-rss PATENT OFFICE.-

zoan rmnnosrr summer AND JAMES mnnsou. AQSIGKOBLS To GONTINUOUS nnnc'rrou COMPANY LIMITED. or LONDON,

or BATTEBSEA, LONDON, ENGLAND.

ENGLAND.

IANUFACTUR-E OE FEBBOMOLYBDENUM.

E9 Prawing.

Tamil whom it may concern:

Be it known that we, one: Mtrnooofl Summer and Janus Miznsozs. bothsulneots oi t e King of Great Britain. residing at 155 Church Road, Battersea, ondon; England, have invented new and useful Improvements in the Manufacture of Ferromolybdenum. of which the iollowin r is aspeci cation.

This invention re ates to improvements in th manufacture of ferrmnolybdenumgi e., elioys of molybdenum e (1 iron m various proportions, contniningl p to about 85 per cent of molybdenum respectively.

These allows have Application filed May 29,

hitl'i erto been manufac-. tured as a, rule from ores or mixtures (.0n-'

- tainin iron and molybdenum by reduction either. n the electric furnace or by the aluminmthermic process. g ln some cases the luminoi-thermic reduct on has been effected ineens (ii 4 mixture o aluminium and teri i but it hasnotfbeen possible to dis- 336 with the use of isubstantiel proper iflq'iiof aluminium, w ioh 1.5 a relatively c .r d c agent; K "e resent. invention is based upon the diseov 1 that ifores or mixtures containing iron an moi bdenum in the form of oxides b, mined wit ulver'med silicon or ferro s1 icicil i end suitable oxidizing agent eont i, ing nitrogen such as sodium nitrate, but next out eluminium, reaction may be initig ted t u point in a eold or heated mixture as in t e aIlumino-thermic process, and it suitnble proportions of the ingred ents be used till reaction proieeds to completion, terromo i denum ract cally free from carbon zirid sili n res n ting.

Aceoifiiug to this invention, therefore, fen romolyb ennu is produced without the uni of aluminium by the silico-thermic reduction of e. mixture of oxide of iron with (ntide (it molybdenum, or of an ore containing iron end In lvbdenum in'the form of oxide, by means 0 sil con or ferrosilieon in the pres ence of i suit..ble oxidizing agent containing nitrogen, such as sodium nitrate or calcium nitrate.

As 9. rule, the richer the reducing agent lS in silicon the better is the reaction. (ommpreigl silicon, which contains up to about 95% or'ferrosihcon containing from il e can be used with excellent results.

1922. seruu No. 564,616.

It will be understood that with ferrosilicon 'conta mlng lower proportions of siliconthe reaction becomes more sluggish and a limit-- ing composition is reached which depends.

upon the method of working. Commercial ores. with dition of iron oxide, can be used for the purose of the invention and are if necessary subjected to a preliminary fiatment haying for its object the removal oi tin compoun s, sulphur or other injurious matter such as'alrsenic or bismuth or an excess of silicious im purities, and conversion of all the iron. and molybdenum into the form of oxide.

The following example illustrates vention:-

A molybdenum ore containing per cent of M and 6 per cent of FeO is subjected to a preliminary purification to remove any bismuth present and isthen treated to remove'the sulphur. 0f the product abont140 lbs. (containing lbs. M00 are mixed with 20 lbs. of mill scale, 37 lbs. of ferrosilicon (90% Si) and 10 lbs. of sodium nitrate. Preferably 8 lbs. of calcium fluoride are added to enhance the fluidity of the slag. The mixture is put into a crucible and reaction is initiated as in the alumino-thermie u'ocess.

Viheit we claim is 1. The manufacture of ferromolybdenum without the aid of aluminium by the silico t-hermie reduction of iron oxide and molyb denum "oxide in the presence of an oxidizing agentcontaining nitrogen.

2. The manufarture'of hirroniolybdenl\m without the aid of a-luininium by the silicotherniic reduction of iron oxide and molybdenum oxide in the presence of sodium nitrate.

The manufacture of ferromolylulenum by purifying the molybdenum ore to remove bismuth and sulphur. mixing the product with iron oxide. terrosilirrm and an oxidizing agent containing nitrogen and producing reaction as in the well known alumino thermic proce s.

4-. lhe manufacture of ferromolybdenum without the aid of aluminum by the silicothermir eduction of iron oxide and m0lyb denim: oxide in the pres nro of a nitrate oxi- -.liz n,-1 agent.

the intorrornolybdenum or without the adby purifyin the molybdenum ore to remove of mill sca1e, 37 parts of ferrosilicon and I0 bismuth 1mg sulphur, mixing the product parts of sodium nitrate. In with iron oxide, ferrosilicofi 51nd a nitrate In testimony that; we claim the foregoing oxidizing agent :md producing reaction as in as our invention we have signed our names 5 the'well known alummo-thermic process. this 17th day of May, 1922.

6. The manufacture of ferromol ybdenum by a silico-thermicreaction in a mlxture of JOHN MURDOCH SHELLEY. 140 parts purified molybdenum ore, 20 parts JAMES MERSON. 

